﻿using System;
using System.IO;
using System.Threading;

namespace AppUpdate.Utils
{
    public class TheNetworkFile
    {
        public delegate void ProgressOfTheProcessing(int TheProgressOf,long totalDownloadedByte,long totalBytes);


        /// <summary>        
        /// 下载文件        
        /// </summary>        
        /// <param name="URL">下载文件地址</param>       
        /// 
        /// <param name="Filename">下载后的存放地址</param>        
        /// <param name="progressOfTheProcessing">用于显示的进度条</param>        
        /// 
        public void DownloadFile(string URL, string filename, ProgressOfTheProcessing progressOfTheProcessing)
        {
            float percent = 0;
            System.Net.HttpWebRequest Myrq = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(URL);
            System.Net.HttpWebResponse myrp = (System.Net.HttpWebResponse)Myrq.GetResponse();
            long totalBytes = myrp.ContentLength;
            System.IO.Stream st = myrp.GetResponseStream();
            System.IO.Stream so = new System.IO.FileStream(filename, System.IO.FileMode.Create, FileAccess.ReadWrite);
            long totalDownloadedByte = 0;
            byte[] by = new byte[1024];
            int osize = st.Read(by, 0, (int)by.Length);
            while (osize > 0)
            {
                totalDownloadedByte = osize + totalDownloadedByte;
                //System.Windows.Forms.Application.DoEvents();
                so.Write(by, 0, osize);
                osize = st.Read(by, 0, (int)by.Length);
                percent = (float)totalDownloadedByte / (float)totalBytes * 100;
                if (osize%3==0) 
                {
                    progressOfTheProcessing(Convert.ToInt32(percent), totalDownloadedByte, totalBytes);
                }
                
            }
            so.Close();
            st.Close();
        }

    }
}
